Method and system for transport of packet-based datastreams over frame-based transport systems employing physically diverse transmission channels
View Patent ↗A transport unit is disclosed. On a transmit side, the transport unit includes a payload data unit (PDU) formation unit, a frame formation unit and a scheduler. An input of the scheduler is coupled to the PDU formation unit, and an output of the scheduler is coupled to the frame formation unit. On a receive side, the transport unit includes a distribution unit (which includes a group synchronization unit), a channel resequencing unit (coupled to the group synchronization unit), and a scheduler (coupled to the channel resequencing unit).
1. A transport unit comprising:
a plurality of payload data unit (PDU) formation units, wherein a PDU formation unit of said PDU formation units is configured to add PDU overhead information to data received as a data stream received by said PDU formation unit;
a plurality of frame formation units; and
a scheduler, wherein
an input of said scheduler is coupled to said plurality of PDU formation units,
an output of said scheduler is coupled to said plurality of frame formation units,
said scheduler is configured to receive a PDU stream from each of said PDU formation units and to provide PDUs of said PDU streams to said frame formation units,
said scheduler is configured to provide said PDUs to said frame formation units using a strict-priority round-robin scheduling methodology, and
each of said frame formation units are configured to generate a frame comprising the provided PDUs.
2. The transport unit of claim 1 , wherein said PDU formation unit of said PDU formation units is further configured to encapsulate said data prior to said adding said PDU overhead information.
3. The transport unit of claim 1 , wherein a frame formation unit of said frame formation units is configured to add frame overhead information to received PDUs of the PDU stream received by said frame formation unit.
4. The transport unit of claim 3 , wherein said frame formation unit is further configured to add a stuff byte prior to said adding said frame overhead information.
5. A transport unit comprising:
a distribution unit, wherein said distribution unit comprises
a group synchronization unit configured to
receive a plurality of payload data units (PDUs), wherein each of said PDUs belong to one of a plurality of groups, and
synchronize said PDUs based on a one of said groups to which each of said PDUs belongs,
a channel resequencing unit, coupled to said group synchronization unit, and configured to
resequence data received from a plurality of channels in order to place the data in a same channel order as when the data was transmitted, and
perform said resequencing based upon a channel identifier associated with the data, and
a scheduler coupled to said channel resequencing unit, wherein
said scheduler is configured to select data stored by said channel resequencing unit and provide said data to a data extraction unit.
6. The transport unit of claim 5 , further comprising:
a line interface; and
a client interface, wherein
an input of said distribution unit is coupled to said line interface, and
an output of said distribution unit is coupled to said client interface.
7. The transport unit of claim 6 , wherein said line interface comprises:
a plurality of channel synchronization units.
8. The transport unit of claim 6 , wherein said client interface comprises:
a plurality of data extraction units.
9. The transport unit of claim 5 , wherein said distribution unit further comprises:
a plurality of deskew FIFOs, said deskew FIFOs coupled between said channel resequencing unit and said scheduler.
10. The transport unit of claim 9 , wherein said channel resequencing unit is configured to
receive a plurality of payload data units (PDUs), and
resequence said PDUs to place said PDUs in a sequence for extraction by said scheduler.